Section-liner attachment for parallel-rulers



(No Model.)

- J. 0. RICHARDSON. SECTION LINER ATTACHMENT FOR PARALLEL RULERS.

Patented Oct. 5,1897.

INVENTOR A TTOR/VEYS.

UNITED STATES PATENT ()FFICE.

JOHN C. RICHARDSON, OF MIDDLESBOROUGH, KENTUCKY.

SECTION-LINER ATTACHMENT FOR PARALLEL-RULERS.

SPECIFICATION forming part of Letters Patent No. 591,296, dated October 5, 1897. Application filed September 14, 1896. Serial No. 605,747. (No model.)

To all whom it may concern.-

Be it known that I, JOHN C. RICHARDSON, of Middlesborough, in the county of Bell and State of Kentucky, have invented a new and Improved Sectional-Liner Attachment for Parallel-Rulers, of which the following is a full, clear, and exact description;

The object of the invention is to provide a new and improved attachment for parallelrulers to enable the user to conveniently and rapidly draw sectional lines equally spaced apart.

The invention consists principally of an arm adjustable on one of the members of the parallel-ruler and a stop-pin held on the other member and adapted to be engaged by the said arm.

The invention also consists of certain parts and details and combinations of the same, as will be fully described hereinafter and then pointed out in the claims.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the figures.

Figure 1 is a plan view of the improvement. Fig. 2 is a side elevation of the same. Fig. 3 is a side elevation of the post for the, arm. Fig. at is a plan view of the same. Fig. 5 is a plan view of a modified form of post and arm, and Fig. 6 is a side elevation of the same. The parallel-ruleris provided with the usual members A A, connected with each other by parallel links B, as plainly shown in the drawings. On the member A, and preferably near the middle thereof, is secured a post (3, carrying at its upper end a nut C for engaging and clamping a transverse arm D, formed witha longitudinal slot D, fitted to slide on a square offset 0 'formed on the post (J.

The'forward end of the arm D extends upon the member A, and on this end is formed a foot D adapted to engage a stop-pin E, secured on the member A. A graduation F is marked on the arm D, so as to enable the user to set the attachment according to the desired spaces between the sectional lines.

When the device is to be used for drawing parallel sectionallines placed equidistant apart, the arm D is adjusted, so that when the members A A are opened up then the or other article on which lines are to be drawn in the open position shown in Fig. 1, then the operator draws a line along the edge of the member A and then closes this memberupou the member A and holds both members stationary to draw a second line along the member A. The member A is then opened, while the member A is held stationary, and then the member A is closed upon the member A and a third line is drawn along the edge of the member A.

The above-described operation is repeated for drawing any desired number of sectional lines.

It is evident that the lines are placed equal distances apart, as the opening and closing of the members A A are limited by the stoppin E and the arm D.

As illustrated in Figs. 5 and 6, the'post C is provided with a transverse aperture, in which is fitted to slide an arm D adapted to be secured in place on the post by a setscrew 0 The operation and application of the modified form are the same as above described in reference to the arm D and post 0.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. Asectional-liner attachment for parallelrulers, comprising an arm slidably and adj ustably held on one member of the ruler and having its other end'proj ectin g over the other member of the rule and provided with a horizontally-projecting foot, and a stop-pin on the member of the ruler over which the free end of the said arm projects and with which the foot of the said arm engages to limit the opening movement of the members of the ruler, substantially as described.

2. A sectional-liner attachment for parallelrulers, comprising apost secured on one of the members of the ruler, an arm fitted to slide on the said post and adapted to be secured thereto, said arm being formed with a horizontally-projecting foot, and a stop-pin held on the other member of the ruler and adapted to be engaged by the foot of the said arm, the members of the ruler being free to move toward each, but movable from each other only a predetermined distance, substantially as shown and described.

3. An attachment for parallel-rulers, comprising a post secured to one member of the ruler and provided with a nut on its end, a slotted arm fitting on the post and having one end projecting upon the other member of the ruler and provided with a horizontally-projecting foot, a nut for clamping the arm in the post, and a stop-pin on the said member of the ruler and with which the foot engages, to limit the opening movement of the members of the ruler,substantially as herein shown and described.

, JOHN C. RICHARDSON. lVitnesses:

H. l\[. AXLINE, N. C. HUDGINS. 

